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A car company tested a sports car on a road with different inclines. The test driver tested the car by driving a distance of x miles on a flat road, (x2 + 3) miles downhill, and (x - 7) miles uphill. Which simplified expression is equivalent to the total distance, in miles, for which the car was tested?

3x2 _ 4

3x2 + 10

x2 + 2x - 4

x2 + 2x + 10


I suck at word problems

Respuesta :

Edufirst
Total distance = flat road + downhill + uphill

Total distance = x + (x^2 + 3) + (x -7) = x + x^2 + 3 + x - 7 = x^2 + 2x - 4

Answer: the third option, x^2 + 2x - 4